Toyotomi KURO Mini Service Manual page 5

Display method of indoor unit
Indicator display
Error
Power Cool
code
indicator indicator
Flash
19
times
Flash
once
Flash 3
times
Flash 4
times
Flash 5
times
Flash 7
times
Flash 8
times
Flash Flash
once once
Flash 3
times
Flash 4
times
38
Malfunction
name
Heat
indicator
Liquid valve
temperature
sensor is ON /
short-circuited
High pressure Cool/Dry: all loads stops
protection of operation except indoor fan;
system Heat: all loads stops operation.
Low pressure/ Cool: compressor, outdoor fan
low system and indoor fan stop operation;
pressure Heat: compressor and outdoor
protection/ fan stop operation at first. About
compressor 1min later, indoor fan stops
low pressure operation; 2mins later, the 4-way
protection valve stop operation.
High discharge Cool/Dry: compressor and
temperature outdoor fan stops operation, while
protection of indoor fan operates;
compressor Heat: all loads stops operation.
AC overcurrent Cool/Dry: compressor and
protection outdoor fan stops operation, while
indoor fan operates;
Heat: all loads stops operation.
Mode shock/ Load of indoor unit stops
sysmte mode operation (indoor fan, E-heater,
shock swing)
High Cool: compressor stops operation
temperature while indoor fan operates;
prevention Heat: all loads stops operation.
protection
Flash Malfunction of Cool/Dry: compressor stops
15 EEPROM operation, while indoor fan
times operates;
Heat: all loads stops operation.
Refrigerant- Cool/Dry: compressor and
recovery mode outdoor fan stops operation, while
indoor fan operates.
Outdoor Cool/Dry: compressor and
ambient outdoor fan stop operation, while
temperature indoor fan operates;
is open/short- Heat: all loads stops operation.
circuited
Outdoor Cool/Dry: compressor and
condenser outdoor fan stop operation, while
temperature indoor fan operates;
sensor is open/ Heat: after operating for 3mins,
short-circuited all loads stops operation.
AC status
1. Temperature sensor is not well connected or damaged; (refer
to Page 69 "Table 2")
2. The wire of temperature sensor is damaged, causing short
circuit to copper pipe or outer casing;
3. Main board of outdoor unit is damaged.
1. Heat exchange of outdoor unit is too dirty, or it blocked the
air inlet/outlet;
2. Ambient temperature is too high;
3. Is power voltage normal; (three-phase unit)
4. Refrigerant is too much.
5. Wiring of high pressure switch is loose or high pressure
switch is damaged;
6. The internal system is blocked; (dirt blockage, ice blockage,
oil blockage, angle valve is not completely opened)
7. Main board of outdoor unit is damaged;
1. Low pressure switch is damaged;
2. Refrigerant inside the system is insufficient.
See Page 49 "Overload protection of compressor , High
discharge temperature protection of compressor"
Fixed speed unit:
1. System abnormality; (e.g.: blockage)
2. Rotate speed of outdoor motor is abnormal; (cooling)
3. Outdoor air inlet is abnormal; (cooling)
4. System is normal, but the resistance of compressor
exhausting temperature sensor is abnormal or poorly
connected.
1. Power voltage is unstable;
2. Power voltage is too low;
3. System load is too high, which leads to high current;
4. Heat exchange of indoor unit is too dirty, or it blocked the air
inlet/outlet;
5. Fan motor operation is abnormal; the fan speed is too low or
not functioning;
6. Compressor is blocked;
7. The internal system is blocked; (dirt blockage, ice blockage,
oil blockage, angle valve is not completely opened)
8. Main board of outdoor unit is damaged.
See Page 60 "AC overcurrent protection"
Malfunction of one-to-more system; there may be two indoor
units which has set the shock mode, such as one is cooling
and the other is heating.
See Page 53 "High temperature prevention protection; high
power; system isabnormal"
Main board of outdoor unit is damaged.
Refrigerant recovery. The maintenance personnel operate it
when he is maintaining the unit.
1. Temperature sensor is not connected well or damaged; (refer
to Page 69 "Table 1")
2.Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or
outer case
3.Main board of outdoor unit is damaged;
1. Temperature sensor is not connected well or damaged; (refer
to Page 69 "Table 2")
2. Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or
outer case;
3. Main board of outdoor unit is damaged.
Possible causes